Ammonia → 5-Methoxy-3-(1-methylethoxy)-1H-indole-2-carboxamide

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Lithium amide in liquid ammonia is prepared as described by Unangst PC and Carethers ME, J. Heterocyclic Chem. 1984;21:709, from lithium metal ribbon (0.059 g, 8.5 mmol). A solution of methyl 5-methoxy-3-(1-methylethoxy)-1H-indole-2-carboxylate (0.15 g, 0.57 mmol; Unangst PC, et al., J, Heterocyclic Chem. 1987;24:811) in 4.0 mL of tetrahydrofuran is added dropwise. The mixture is stirred for 1 hour and the excess ammonia is allowed to evaporate. The residue is diluted with ethyl acetate, and the organic layer is washed with 1.0N HCl brine, saturated sodium bicarbonate solution, and brine again. The solution is dried (anhydrous magnesium sulfate) and evaporated. Recrystallization of the residue from ethyl acetatehexane gives 0.11 g (76%) of product; mp 138.5°-140° C.

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